Integrated image sensor and lens assembly

ABSTRACT

An integrated image sensor and lens assembly comprises an image sensor substrate, an image sensor assembly mounted on the image sensor substrate and housing an image sensor, the image sensor assembly having one or more side walls, a lens barrel including one or more lenses, and an adhesive formed between a region of the lens barrel and the one or more side walls, the region being directly adhered to the one or more side walls via the adhesive.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation of U.S. patent application Ser. No.16/144,140, filed on Sep. 27, 2018, which is a continuation of U.S.patent application Ser. No. 14/705,891, filed on May 6, 2015, now U.S.Pat. No. 10,122,902, which claims the benefit of U.S. Provisional PatentApplication Ser. No. 61/990,053, filed May 7, 2014 and U.S. ProvisionalPatent Application Ser. No. 62/019,146, filed Jun. 30, 2014. The subjectmatter of each of the above-identified applications is incorporatedherein by reference in its entirety.

BACKGROUND

Manufacturing of lens assemblies for high-resolution cameras typicallyrequire a high degree of precision in positioning components of the lensassembly to ensure that the lens will achieve proper focus. As a result,a challenge exists in achieving a fast, automated, and high-yieldingassembly process for high-resolution cameras.

In a conventional manufacturing process, a lens barrel housing thecamera lens is placed within a housing assembly affixed to an imagesensor. Upon testing the lens barrel to position it for properalignment, the lens barrel is affixed to the housing assembly using a“floating” assembly process whereby the lens barrel is attached to thehousing using adhesive between a ridge of the lens barrel extendingparallel to the image plane and an inner lip of the housing extendingparallel to the image plane. The adhesive may expand and/or contractwhen cured, or after curing, the adhesive may expand and/or contractover time based on changes in temperature or other conditions. Becausethe adhesive is placed between surfaces of the lens barrel and housingthat are parallel to the image plane, the expansion or contraction ofthe adhesive causes the lens to shift along the optical axis, thusaltering the distance between the lens and the image sensor. Thisaffects focus of the lenses and compromises performance and yield.

DETAILED DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an exploded view of an example integrated imagesensor and lens assembly, according to one embodiment.

FIG. 2 illustrates a cross-sectional view of the lens holder and lensbarrel sliced along a plane parallel to the optical axis, according toone embodiment.

FIG. 3 illustrates a cross-sectional view of the lens holder and lensbarrel sliced along a plane parallel to the optical axis, according toone embodiment.

FIG. 4 illustrates a cross-sectional view of the lens holder and lensbarrel sliced along a plane parallel to the optical axis, according toone embodiment.

FIG. 5 illustrates an example integrated sensor and lens assemblyundergoing a curing process during manufacture, according to anembodiment.

FIG. 6 is an enlarged view of the example integrated sensor and lensassembly undergoing the curing process during manufacture as illustratedin FIG. 5.

FIG. 7 illustrates an example integrated sensor and lens assembly in anexample camera body, according to one embodiment.

FIG. 8 illustrates an example camera that includes the exampleintegrated image sensor and lens assembly of FIG. 1.

DETAILED DESCRIPTION

The figures and the following description relate to preferredembodiments by way of illustration only. It should be noted that fromthe following discussion, alternative embodiments of the structures andmethods disclosed herein will be readily recognized as viablealternatives that may be employed without departing from the principlesof what is claimed.

Reference will now be made in detail to several embodiments, examples ofwhich are illustrated in the accompanying figures. It is noted thatwherever practicable similar or like reference numbers may be used inthe figures and may indicate similar or like functionality. The figuresdepict embodiments of the disclosed system (or method) for purposes ofillustration only. One skilled in the art will readily recognize fromthe following description that alternative embodiments of the structuresand methods illustrated herein may be employed without departing fromthe principles described herein.

Configuration Overview

In an embodiment, an integrated image sensor and lens assembly comprisesa lens barrel adhered to a lens holder using an adhesive ring appliedbetween an exterior surface of the lens barrel and an interior surfaceof the lens holder that are oriented in a direction perpendicular to theimage plane (parallel to the optical axis). The lens barrel and lensholder are bonded based on the sheer strength (rather than the tensilestrength) of the adhesive. Thus, adhesive expansion does notsubstantially affect the distance between the lens and the image sensorand therefore does not affect the focal plane of the assembly. Asdescribed herein, substantially constant refers to the optical distanceis within a predefined tolerance that would be acceptable to thoseskilled in art. In various embodiments, the predefined tolerance can be,for example, a 1% tolerance, a 2% tolerance, a 5% tolerance, etc. Whileexpansion or contraction of the adhesive may still occur, the forces aredirected radially (rather than axially) and are counteracted because theadhesive is applied concentrically.

In another embodiment, an integrated image sensor and lens assemblycomprises a lens barrel adhered to an image sensor assembly using anadhesive applied between a surface of the lens barrel and an outer sidewall of the image sensor assembly that are oriented in a directionperpendicular to the image plane (parallel to the optical axis). Thelens barrel and image sensor assembly are bonded based on the sheerstrength (rather than the tensile strength) of the adhesive. Thus,adhesive expansion does not substantially affect the distance betweenthe lens and the image sensor and therefore does not affect the focalplane of the assembly. While expansion or contraction of the adhesivemay still occur, the forces are directed radially (rather than axially)and are counteracted because the adhesive is applied concentrically.

FIG. 1 illustrates an exploded view of an embodiment of an integratedimage sensor and lens assembly 100. The integrated image sensor and lensassembly 100 comprises an image sensor substrate 140, an image sensorassembly 130, a lens holder 120, and a lens barrel 110. The image sensorsubstrate 140 comprises a printed circuit board for mounting the imagesensor assembly 130 and may furthermore include various electroniccomponents that that operate with the image sensor assembly 130 orprovide external connections to other components of the camera system.The image sensor assembly 130 houses an image sensor (e.g., ahigh-definition image sensor) for capturing images and/or video andincludes structural elements for physically coupling the image sensorassembly 130 to the image sensor substrate 140 and to the lens holder120. The image sensor of the image sensor assembly 130 lies on an imageplane 160. The lens holder 120 physically couples with the image sensorassembly 130 and the lens barrel 110. In one embodiment, the lens holder120 comprises a base portion 124 and a tube portion 122. The baseportion 124 includes a bottom surface in a plane substantially parallelto a surface of the image sensor substrate 140. Furthermore, the baseportion 124 includes a recess (not viewable in FIG. 1) to enable thebottom surface of the base portion 124 to lie flat against the imagesensor substrate 140 while partially enclosing the image sensor assembly130. The tube portion 122 of the lens holder 120 extends away from theimage sensor assembly 130 along the optical axis 150 and includes asubstantially cylindrical channel for receiving the lens barrel 110. Thelens barrel 110 comprises one or more lenses or other optical componentsto direct light to the image sensor assembly 130. The lens barrel 110comprises a lower portion 116, one or more barrel arms 114, and a lenswindow 112. The lower portion of the lens barrel 116 is substantiallycylindrical and structured to at least partially extend into the channelof the tube portion 122 of the lens holder 120. The lens arms 114 extendradially from the body of the lens barrel 110 and are outside thechannel of the lens holder 120 when assembled. The lens arms 114 may beused to physically couple the lens barrel 110 to the camera body (notshown). The lens window 112 includes optical components to enableexternal light to enter the lens barrel 110 and be directed to the imagesensor assembly 130.

FIG. 2 illustrates a cross-sectional view of the lens holder 120 andlens barrel 110 sliced along a plane parallel to the optical axis 150.Interior components (e.g., lenses) of the lens barrel 110 are omitted tomore clearly show the structural features of the lens barrel 110. Asillustrated in FIG. 2, the lower portion 116 of the lens barrel 110partially extends into the tube portion 122 of the lens holder 120. Anadhesive 234 is applied between an interior surface of the tube portion122 that is oriented parallel to the optical axis 150 and an exteriorsurface of the lower portion 116 of the lens barrel 110 (also orientedparallel to the optical axis 150) to radially bond the lens barrel 110to the lens holder 120. The section of the lower portion 16 of the lensbarrel 110 that extends into the tube portion 122 of the lens holder 120is adhered to the tube portion 122 via the adhesive 234. The lens barrel110 and lens holder 120 are bonded based on the sheer strength of theadhesive 234. If expansion of the adhesive 234 occurs, the forces willbe directed radially (i.e., along a plane parallel to the image plane)and will therefore not substantially affect the distance between thelens of the lens barrel 110 and the image plane 160.

In the illustrated embodiment, the lower portion 16 of the lens barrel110 includes a plurality of ridges 236 on the exterior surface. Theridges 236 increase the surface area on the exterior surface of thelower portion 116 for the adhesive 234 to bond to and thereby increasethe adhesive strength.

The illustrated embodiment also shows a gasket 232 positioned at a lowerend of the lens barrel 110 just below the adhesive 234. The gasket 232may be used in the manufacturing process as a barrier to prevent theadhesive 234 from overflowing and potentially reaching the image sensorif the adhesive 234 is insufficiently viscous. In one embodiment, thegasket 232 comprises a pliable material (e.g., rubber, plastic, etc.) sothat it does not prevent fine adjustments from being made to thepositioning of the lens barrel 110 relative to the image sensor assembly130 along the optical axis during the assembly and alignment process.The pliability of the gasket 232 furthermore absorbs any forces alongthe optical axis caused by expansion or contraction of the adhesive 234.

FIG. 3 illustrates a cross-sectional view of the lens holder 120 andlens barrel 110 sliced along a plane parallel to the optical axis 150.In the illustrated example, the interior surface of the lens barrel 110is substantially smooth and the adhesive 234 is applied to the interiorsurface of the lens barrel 110.

FIG. 4 illustrates a cross-sectional view of the lens holder 120 andlens barrel 110 sliced along a plane parallel to the optical axis 150.The gasket 232 is omitted in this illustrated embodiment.

FIG. 5 illustrates an embodiment of an integrated sensor and lensassembly undergoing a curing process during manufacture. In theillustrated embodiment, the lens holder 110 includes one or more ports506 that enable ultraviolet (UV) rays to pass through from the LED UVsystem 504. The UV rays cure the adhesive 234 and thereby to lock thelens barrel 110 and lens holder 120 in place after tested and properlyaligned. A top ring UV cure 502 is also applied to the top of the lensholder 110. In one embodiment, the lens holder 120 includes four ports506 equally spaced around the circumference of the tube portion 122 ofthe lens holder 110. Alternatively, three equally spaced ports 506 or adifferent number or configuration of ports 506 may be used.

The curing process settles the lens barrel 110 in the lens holder toprovide the desired modulation transfer function (MTF) and focusesposition of the lenses prior to further thermal curing. As illustratedin FIG. 6, the adhesive has a curing depth such that it immobilizes thesettled lens barrel 110 prior to thermal curing. Particularly, the depthof the adhesive from the external opening of the pot 506 to the interiorsurface of the lens barrel 110 (for example, the depth 610 in FIG. 6)locks the lens barrel 110 in place even before curing is applied.

FIG. 7 illustrates another alternative embodiment of an integratedsensor and lens assembly 702 for use in a camera body 700. The lensassembly 702 comprises a lens barrel 110, an image sensor substrate 140,and an image sensor assembly 130. Similar to the embodiment illustratedin FIG. 1, the image sensor substrate 140 comprises a printed circuitboard for mounting the image sensor assembly 130 and may furthermoreinclude various electronic components that that operate with the imagesensor assembly 130 or provide external connections to other componentsof the camera system. The image sensor assembly 130 houses an imagesensor (e.g., a high-definition image sensor) for capturing imagesand/or video and includes structural elements for physically couplingthe image sensor assembly 130 to the image sensor substrate 140 and tolens barrel 110. The image sensor of the image sensor assembly 130 lieson an image plane 160.

The lens barrel 110 comprises one or more lenses or other opticalcomponents to direct light to the image sensor assembly 130. The lensbarrel 110 comprises a lower portion 116 and an upper portion 704 havinga lens window 112. The lower portion of the lens barrel 116 includes achannel 706 for receiving the image sensor assembly 130. The channel 706can be substantially cylindrical, square, rectangular, or other shaped.The lens barrel 110 may be physically coupled to the camera body 700.The lens window 112 includes optical components to enable external lightto enter the lens barrel 110 and be directed to the image sensorassembly 130. The lens barrel 110 is positioned such that the imagesensor assembly 130 protrudes into the channel 706. An interior surfaceof the lens barrel 110 is oriented to be substantially perpendicular tothe image plane 160 and substantially parallel to the optical axis 150.

The image sensor assembly 130 is adhered to the interior surface of thelens barrel 110 directly via the adhesive 234, without a separate lensholder. The image sensor assembly 130 includes a plurality of side wallsoriented in a direction substantially perpendicular to the substrate140. The adhesive 234 is applied between the interior surface of thelens barrel 110 and an outer side wall of the image sensor 130. Theintegrated sensor and lens assembly 702 is substantially cylindrical,square, or rectangular.

In one embodiment, the channel 706 of the lens barrel 110 issubstantially square or rectangular and the image sensor assembly 130 issubstantially square or rectangular. The channel 706 of the lens barrel110 mates with the image sensor assembly 130 such that an interiorsurface of the channel 706 of the lens assembly 1302 adheres to theouter side wall of the image sensor 130. In another embodiment, thechannel 706 of the lens barrel 110 may be substantially circular andmate with a substantially circular image sensor 130. In yet anotherembodiment (not shown), an adhesive 234 is applied between a top surfaceof the image sensor assembly 130 and a shelf that protrudes from aninterior surface of the lens barrel 112 in a direction substantiallyparallel to the top surface of the image sensor 130. Other embodimentsand features described above (e.g., the use of gasket 232, the use ofridges 236) may be combined with the embodiment of FIG. 13 in which thelens assembly 702 includes a lens barrel adhered to the image sensorassembly 130 via the adhesive 234 directly. The gasket may be positionedat a lower end of the lens barrel 110 just below the adhesive 234.

Example Camera System Configuration

FIG. 8 illustrates an embodiment of an example camera 800 that includesthe integrated image sensor and lens assembly 100 described above. Thecamera 800 comprises a camera body having a camera lens structured on afront surface of the camera body, various indicators on the front of thesurface of the camera body (such as LEDs, displays, and the like),various input mechanisms (such as buttons, switches, and touch-screenmechanisms), and electronics (e.g., imaging electronics, powerelectronics, etc.) internal to the camera body for capturing images viathe camera lens and/or performing other functions. The camera I 800 isconfigured to capture images and video, and to store captured images andvideo for subsequent display or playback. As illustrated, the camera 800includes a lens 802 configured to receive light incident upon the lensand to direct received light onto an image sensor internal to the lens.The lens 802 is enclosed by a lens ring 804, which are both part of theintegrated image sensor and lens assembly 100 discussed above.

The camera 800 can include various indicators, including the LED lights806 and the LED display 808. The camera 800 can also include buttons 810configured to allow a user of the camera to interact with the camera, totum the camera on, and to otherwise configure the operating mode of thecamera. The camera 800 can also include a microphone 812 configured toreceive and record audio signals in conjunction with recording video.The side of the camera 800 includes an I/O interface 814.

Additional Configuration Considerations

Throughout this specification, some embodiments have used the expression“coupled” along with its derivatives. The term “coupled” as used hereinis not necessarily limited to two or more elements being in directphysical or electrical contact. Rather, the term “coupled” may alsoencompass two or more elements are not in direct contact with eachother, but yet still co-operate or interact with each other, or arestructured to provide a thermal conduction path between the elements.

Likewise, as used herein, the terms “comprises,” “comprising,”“includes,” “including,” “has,” “having” or any other variation thereof,are intended to cover a non-exclusive inclusion. For example, a process,method, article, or apparatus that comprises a list of elements is notnecessarily limited to only those elements but may include otherelements not expressly listed or inherent to such process, method,article, or apparatus.

In addition, use of the “a” or “an” are employed to describe elementsand components of the embodiments herein. This is done merely forconvenience and to give a general sense of the invention. Thisdescription should be read to include one or at least one and thesingular also includes the plural unless it is obvious that it is meantotherwise.

Finally, as used herein any reference to “one embodiment” or “anembodiment” means that a particular element, feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment. The appearances of the phrase “in oneembodiment” in various places in the specification are not necessarilyall referring to the same embodiment.

Upon reading this disclosure, those of skill in the art will appreciatestill additional alternative structural and functional designs for acamera expansion module as disclosed from the principles herein. Thus,while particular embodiments and applications have been illustrated anddescribed, it is to be understood that the disclosed embodiments are notlimited to the precise construction and components disclosed herein.Various modifications, changes and variations, which will be apparent tothose skilled in the art, may be made in the arrangement, operation anddetails of the method and apparatus disclosed herein without departingfrom the spirit and scope defined in the appended claims.

What is claimed is:
 1. An image and lens assembly for an image capturingdevice, the image and lens assembly comprising: a substrate; an imagesensor assembly supported by the substrate, the image sensor assemblydefining an optical axis and an optical plane extending in perpendicularrelation to the optical axis; an outer member positioned adjacent to thesubstrate, the outer member including: a base defining a recessreceiving the image sensor assembly; and a body portion extending fromthe base in parallel relation to the optical axis, the body portionincluding: an uppermost surface; a tapered, non-threaded surfaceextending from the uppermost surface at an angle to the optical axis;and an inner surface extending from the tapered, non-threaded surfacesuch that the tapered, non-threaded surface extends between theuppermost surface and the inner surface; and an inner member extendinginto the outer member, the inner member secured to the outer member byan adhesive applied between the inner member and the outer member suchthat the adhesive extends in non-perpendicular relation to the opticalaxis, the inner member including a ridges extending along a portion ofan overall length of the inner member.
 2. The image and lens assembly ofclaim 1, wherein the ridges extend radially from an outer surface of theinner member and include a plurality of ridges spaced axially from eachother along the optical axis.
 3. The image and lens assembly of claim 2,wherein the inner member defines a first end and a second end oppositeto the first end, the ridges spaced axially from each of the first endand the second end of the inner member.
 4. The image and lens assemblyof claim 3, wherein the outer surface of the inner member includes asmooth section spaced axially from the ridges.
 5. The image and lensassembly of claim 1, wherein the adhesive extends into the body portionof the outer member.
 6. The image and lens assembly of claim 1, whereinthe substrate includes a printed circuit board.
 7. The image and lensassembly of claim 6, wherein the image sensor assembly is mounted to theprinted circuit board.
 8. An image and lens assembly for an imagecapturing device, the image and lens assembly comprising: a substratesupporting an image sensor assembly, the image sensor assembly definingan optical axis and an image plane extending in perpendicular relationto the optical axis; a lens holder including: a base portion defining arecess configured to receive the image sensor assembly; and a tubeportion extending from the base portion along the optical axis and inperpendicular relation to the image plane; and a lens barrel extendinginto a channel defined by the tube portion of the lens holder anddefining an exterior surface including ridges, wherein the lens barrelis secured to the lens holder via an adhesive applied to an inner,non-threaded wall of the lens holder extending in non-perpendicularrelation to the optical axis.
 9. The image and lens assembly of claim 8,wherein lens barrel defines opposite ends and a length extendingtherebetween, the plurality of ridges extending along only a portion ofthe length of the lens barrel.
 10. The image and lens assembly of claim9, wherein the lens barrel includes a smooth surface spaced axially fromthe plurality of ridges.
 11. The image and lens assembly of claim 10,wherein the adhesive extends into the channel defined by the tubeportion of the lens holder.
 12. The image and lens assembly of claim 11,wherein the adhesive contacts the plurality of ridges on the exteriorsurface of the lens barrel.
 13. The image and lens assembly of claim 8,wherein the tube portion defines a tapered surface extending at an angleto optical axis.
 14. The image and lens assembly of claim 13, whereinthe tapered surface extends inwardly from an uppermost surface definedby the tube portion.
 15. The image and lens assembly of claim 8, whereinthe substrate includes a printed circuit board.
 16. The image and lensassembly of claim 15, wherein the image sensor assembly is mounted tothe printed circuit board.
 17. A method of assembling an image and lensassembly for an image capturing device, the method comprising:connecting an image sensor assembly to a substrate such that thesubstrate supports the image sensor assembly; connecting an outer memberto the substrate around the image sensor assembly; inserting an innermember into the outer member such that an upper, non-threaded taperedsurface defined by the outer member extends inwardly towards the innermember at an angle to an optical axis defined by the image sensorassembly; and applying an adhesive between the inner member and theouter member such that the adhesive extends along the upper,non-threaded tapered surface of the inner member in non- perpendicularrelation to the optical axis.
 18. The method of claim 17, whereinconnecting the outer member to the substrate includes positioning theimage sensor assembly within a recess defined by a base of the outermember.
 19. The method of claim 17, wherein applying the adhesiveincludes applying the adhesive such that the adhesive extends into theouter member.
 20. The method of claim 19, wherein applying the adhesiveincludes applying the adhesive such that the adhesive contacts ridgesspaced axially from each other along an exterior surface of the innermember, the ridges extending partially along the exterior surface of theinner member such that the inner member defines a smooth surface spacedaxially from the ridges.